Food is all right, they say (4)
I believe the answer is:
fare
'food' is the definition.
(I know that fare is a type of food)
'all right they say' is the wordplay.
'all' becomes 'f' (I can't justify this - if you can you should give a lot more credence to this answer).
'right' becomes 'r' (common abbreviation).
'they say' shows a homophone (sound like).
'r' sounds like 'are'.
'f'+'are'='FARE'
'is' is the link.
Can you help me to learn more?
(Other definitions for fare that I've seen before include "Menu" , "Meal" , "Food for the table" , "Price of passage" , "Amount charged" .)